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I have my pi plugged into a monitor with HDMI, and I want to use my laptop (running Ubuntu Linux) to control what it displays on the monitor through VNC. Currently, I can connect to the pi with VNC, but what I see in my laptop's VNC window isn't displayed on the monitor - instead, I just see the pi's command prompt. I want the image of the pi's desktop that I see on my laptop to display on the monitor, and I want to be able to control it with my laptop's mouse and keyboard - in short, I want the pi to mirror the VNC client. I'm using Remmina on the client laptop but if there's a better program let me know. In your response, please lay out all the steps and be as painfully specific as you can be - I'm a newcomer to all this.

A similar question to mine was asked here, but I found the answers unclear.

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    If you know of a similar question where you "found the answers unclear", you should explain what you find unclear. Go through it in detail. Otherwise you are putting the onus on others to guess what it is you don't get -- in which case they either will not bother to reply (since you haven't bothered to make a corresponding effort) or else they may explain things in a way which is equally unclear. Q&A's are a two-way street...you can ask a thoughtful question and get a thoughtful answer...or you can just be lazy in hopes someone will do all the work for you... – goldilocks Mar 6 '15 at 1:28
  • @goldilocks thanks for the advice. This was my first post here and I'm still learning the etiquette. I should have been more specific. – Jonathan Cox Mar 7 '15 at 15:29
  • Alright. Thanks for not taking that the wrong way ;) – goldilocks Mar 7 '15 at 15:45
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You could install x11vnc and configure it to get same screen on HDMI and VNC client. See this answer https://raspberrypi.stackexchange.com/a/9610/8697

There are some caveats related to screen size. Also, I believe, you don't get the hardware acceleration, but you don't get this with normal VNC.

You could also install x2x on both devices, but I have never tried this myself.

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You have VNC working, but the output isn't displayed on the monitor. I believe you need to either boot to desktop (options in raspi-config) or on the command prompt run startx. After this, you then connect via VNC and you should be able to do what you are asking.

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